CN2280177Y - Butterfly valve with moveable valve plate - Google Patents

Abstract

The utility model relates to a butterfly valve with a moveable valve plate, which has the advantages of good sealing, higher medium temperature and pressure bearing and automatic compensation after a sealing pair is worn. The valve shaft is composed of an upper valve plate shaft 2 and a lower valve plate shaft 6. One end of the upper valve plate shaft 2 toward a valve plate 4 and one end of the lower valve plate shaft 6 toward the valve plate 4 are respectively connected with the valve plate 4 in floating driving. An eccentric wheel 16 is installed on the other shaft 15. When the valve plate 4 reaches a sealing state, the eccentric wheel 16 and the pressure of a medium push the valve plate 4 toward the direction of a sealing seat 7 to move, which makes the sealing pair sealed under the pressure and the wearing of the sealing pair compensated. The utility model is suitable for the use on middle temperature and middle pressure pipelines.

Description

Valve plate is butterfly valve movably

The utility model relates to movably butterfly valve of a kind of butterfly valve, particularly valve plate.Butterfly valve is a valve commonly used in the water supply and sewage work, general butterfly valve is applicable to the medium of transporting low temperature low pressure, because the conventional construction of butterfly valve own is limit, valve plate can only rotate and can not be shifted, and when valve plate contacts with sealing seat, leans on the elasticity of sealing seat to be sealed, general butterfly valve seal seat is made by rubber, temperature and specific pressure that rubber can bear are lower, and therefore when the temperature that is transferred medium, increased pressure, the rubber seal seat is difficult to finish the sealing task; In addition, after rubber seal seat wearing and tearing, this general butterfly valve mechanism can't compensate, and influences its life-span.Therefore, the butterfly valve of existing structure, can not satisfy and carry elevated pressures and temperature, press in for example (requirement of temperature (250 ℃) media in 2.5～6.4Mpa), and seal life is low.A kind of material that is called filled polytetrafluoroethylene, it is higher that it has heatproof, and specific pressure allowable is bigger, the advantage that friction ractor is little, can be as the sealing seat material of the high pressure valve of anti-the higher temperatures, but its deficiency is to lack flexibility, and can not be used for the butterfly valve of the ball face sealing of existing structure.Therefore the butterfly valve of existing structure generally is used for low-temp low-pressure, can not be used to carry on the pipeline of higher temperature pressure medium use.

The utility model purpose provides movably butterfly valve of a kind of valve plate, with existing structure butterfly valve ratio, has good airproof performance, can bear higher medium temperature and pressure; Behind sealing part abrasion, can be compensated, improve its working life, be suitable for and carry medium temperature and medium pressure (250 ℃ are used on the pipeline of 2.5～2.6Mpa) media.

The utility model is realized by following technological scheme.It is similar with the existing structure butterfly valve on the overall structure, include valve body, valve plate, valve shaft, sealing seat, the valve shaft two ends are contained on the valve body, and pass valve body chamber portion through the valve body center, valve plate is positioned at the valve body chamber, and is contained on this valve shaft, drives valve plate by valve shaft and does 90 ° rotation, sealed by the sphere of valve plate and the sphere on the sealing seat, the sealing seat can adopt the filled polytetrafluoroethylene material.It is characterized in that the last valve shaft 2 of this valve shaft by concentric, lower valve plate axle 6 is formed, this upper and lower valve shaft 2,6 is at the end towards valve plate 4, floating with valve plate 4 respectively is in transmission connection, and this floats to be in transmission connection and can be: towards valve plate 4 one ends the flat side of one φ, 1 dome is arranged respectively at upper and lower valve shaft 2,6, be fixed with axis 5 in the hole of valve plate 4, axis 5 two ends respectively have one with φ 1, the flat side of φ 2 recessed circles that the flat side of dome cooperates, φ 1 and φ 2 decentraction, and φ 2＞φ 1.The flat side's of dome protuberance is inserted into the flat side's of recessed circle recess.When valve plate 4 is in sealing station, C is parallel with the media flow direction for the flat side's fitting surface of protruding, recessed circle, under the pressure medium effect, can slide along the media flow direction, formation compresses sealing, the axle 15 parallel with upper and lower valve plate 2,6 is housed in upper and lower valve shaft 2,6 left sides, has eccentric wheel 16 on this axle 15, have the groove 17 that cooperates with eccentric wheel 16 on the valve plate 4.When valve plate 4 rotated to closed position, the groove 17 on the valve plate 4 was pushed to towards sealing seat 7 and moves under the lift effect of eccentric wheel 16, the sealing of free state can be formed and compress sealing.Both increase sealing load because valve plate 4 can close upper edge, position MEDIA FLOW in the pass to moving, can compensate the wear extent of sealing pair again.

In sum, the utility model adopts valve shaft to be divided into two sections, and the flat side of protruding, the recessed circle that adopts different-diameter in the joint cooperates, make valve plate when closing position, can move and pressurize at flow direction, thus this model utility valve plate movably butterfly valve have good airproof performance, can compensate behind the sealing wear, the advantage of anti-higher temperature is suitable for carrying on the pipeline of medium temperature and medium pressure medium and uses.

Do with embodiment below and specify.

Fig. 1 is a structural representation of the present utility model

Fig. 2 is the A-A sectional drawing among Fig. 1

As shown in Figure 1, be equipped with on the valve body 1 concentric on, lower valve plate axle 2,6, are in transmission connection floating for 4 one-tenth with valve plate respectively of two valve shafts towards an end of valve plate 4, the unsteady transmission of adopting in the present embodiment is: last, lower valve plate axle 2,6 two ends respectively have the flat side of a φ 1 dome, the Kong Zhongyong screw 18 of the left side protuberance of valve plate 4 is fixed with axis 5, two ends of axis 5 respectively have one with φ 1, the flat side of φ 2 recessed circles that the flat side of dome cooperates, φ 1 and φ 2 decentraction, and φ 2＞φ 1, as Fig. 2, the flat side of φ 1 dome is inserted in the flat side's of φ 2 recessed circles the cooperating recesses, by last valve shaft 2 through the flat side of φ 1 dome, when the flat side's drive of φ 2 recessed circles valve plate 4 turns to operating position shown in Figure 1, the two flat orientation of convex-concave circle that cooperate are in position shown in Figure 2, valve plate 4 can slide along the C face by direction F, because the two diameter phi 2＞φ 1, so under external force, the distance of valve plate 4 removable φ 2-φ 1, last, lower valve plate axle 2, axle 15 is housed on the valve body 1 in 6 left sides, on this axle 15 eccentric wheel 16 is housed, the left side protuberance of valve plate 4 has the groove 17 that cooperates with eccentric wheel 16, the bottom land of groove 17 contacts with eccentric wheel 16, when butterfly valve is in low pressure, at valve plate 4 by driveing when the pass turns to operating position, the bottom land of groove 17 is under the effect of eccentric wheel lift, forcing valve plate in the closed position 4 to move towards sealing seat 7 is compressed the sealing of sealing seat 7 from free state, when pipeline internal medium pressure rises from low to high, when pressure surpasses eccentric wheel 16 and acts on impacting force on the valve plate 4, valve plate 4 can continue to move to sealing seat 7 more closely forces together the sealing face, guarantees to reach high pressure sealing.The gland of fixing with screw 20 14 is housed below lower valve plate axle 6, is set with thrust bearing 11 in lower valve plate axle 6 lower ends, there is movable cushion 12 below again, and adjusting screw 13 is housed on the gland 14, regulates the upper-lower positions of valve plate 4 with adjusting screw 13 trace; Sealing seat 7 is adjustable degrees of tightness, with the pressure-regulating sleeve 3 that is positioned at valve body 1 outlet end sealing seat 7 is adjusted after the degrees of tightness fixingly, makes with valve plate 4 and forms the ball face sealing pair, and sealing seat 7 is made by filled polytetrafluoroethylene, can anti-higher temperature and specific pressure; On upper and lower valve shaft 2,6, and flip sleeve 9, the seal arrangement that seal ring 8 is formed all are housed with gland 10 at two ends of axle 15; After the sealing pair wearing and tearing, can unclamp the locking nut 19 of axle 15, to the rotation of lift direction, valve plate 4 is advanced to sealing seat 7 directions, till transferring to sealing, sealing pair is compensated, prolonged working life.

The utility model butterfly valve is suitable in the middle pressure that medium is liquid or gas on the warm pipeline, and this butterfly valve volume is little, in light weight, structure length is 1/3rd of identical nominal diameter ball valve.

Claims (5)

1 valve plate is butterfly valve movably, comprise valve body, valve plate, valve shaft, sealing seat, valve shaft two ends are contained on the valve body, pass the valve body chamber through the valve body center, being positioned at the endoceliac valve plate of valve is contained on this valve shaft, it is characterized in that: valve shaft is made up of last valve shaft (2), the lower valve plate axle (6) of concentric, and this upper and lower valve shaft (2,6) floats with valve plate (4) respectively at the end towards valve plate (4) and is in transmission connection.

2 press movably butterfly valve of the described valve plate of claim 1, it is characterized in that: described float be in transmission connection for: towards an end of valve plate (4) 1 protruding yuan of flat side of a φ is arranged respectively at this upper and lower valve shaft (2,6), be fixed with axis (5) in the hole of valve plate (4), at these axis (5) two ends one 2 recessed yuan of flat sides of φ that cooperate with the flat side of φ 1 dome are arranged respectively, the diameter phi 1 in two gardens, φ 2 differences, and φ 2＞φ 1, when valve plate 4 was in sealing station, two flat sides' fitting surface C and MEDIA FLOW were to parallel.

3 press movably butterfly valve of the described valve plate of claim 1, it is characterized in that: in upper and lower valve shaft (2,6) left side axle (15) is housed, has eccentric wheel (16) on this axle (15), valve plate (4) has the groove (17) that cooperates with eccentric wheel (16).

4 by claim 1 or 3 described valve plates butterfly valve movably, it is characterized in that: gland (14) is housed in the below of lower valve plate axle (6), in lower valve plate axle (6) lower end thrust bearing (11) is housed, movable cushion (12) is positioned at thrust bearing (11) below, and adjusting screw (13) is housed on gland (14).

5 by claim 1 or 3 described valve plates butterfly valve movably, it is characterized in that: the sealing seat (7) that compresses with pressure-regulating sleeve (3) is housed at valve body (1) outlet end.